CN110851003A - Pen pressure information generation system of active capacitive stylus - Google Patents
Pen pressure information generation system of active capacitive stylus Download PDFInfo
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- CN110851003A CN110851003A CN201911133082.6A CN201911133082A CN110851003A CN 110851003 A CN110851003 A CN 110851003A CN 201911133082 A CN201911133082 A CN 201911133082A CN 110851003 A CN110851003 A CN 110851003A
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
- G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of two-dimensional [2D] relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
- G06F3/03545—Pens or stylus
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
- G06F3/038—Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry
- G06F3/0383—Signal control means within the pointing device
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
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- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Position Input By Displaying (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The invention discloses a pen pressure information generation system of an active capacitive touch pen, which comprises the active capacitive touch pen, an induction driving board and a capacitive induction screen body, wherein the active capacitive touch pen comprises a pen point and a pen container, the pen point is assembled at the front end of the pen container, and a pressure sensor, a wireless data transmission circuit, a PCB (printed circuit board), a battery and a power management module are assembled in the pen container. According to the pen pressure information generation system of the active capacitive touch pen, the pressure sensor senses the pressure information of a pen point, the obtained pressure signal is transmitted to the pen point signal processing circuit of the PCB, the pen point signal processing circuit converts the obtained analog signal into a digital signal and transmits the digital signal to the wireless data transmission circuit, the wireless data transmission circuit processes the obtained digital information and transmits the digital signal to the induction driving board, the induction driving board receives the pen pressure information sent by the wireless data transmission circuit, and the induction driving board is combined with the coordinate information obtained by the capacitive induction screen body to obtain a new coordinate form with the pen pressure information, so that the writing effect with the pen pressure is realized.
Description
Technical Field
The invention relates to the technical field of electronic equipment, in particular to a pen pressure information generation system of an active capacitive touch pen.
Background
The existing active capacitance touch pen has two modes for generating the pen pressure information, one mode is an A mode, the mode changes the inductance value through the pressure, so that the frequency of a wireless transmitting signal is changed, and an induction device detects the frequency of the wireless transmitting signal and then converts the frequency into the pen pressure, so that the active capacitance touch pen belongs to a pure analog signal mode for sensing the pen pressure information. The other mode is a mode B, a pressure sensor is placed in the pen, and then pen pressure information is transmitted to the induction device through a self-defined modulation and demodulation wireless signal through a coil antenna of the pen point.
1. The mode A pen pressure information is easy to jump due to external interference through the frequency generated by the analog circuit, and the requirement of the production process on the consistency control of components is very strict, meanwhile, as the components of the product age, the aging degree cannot be controlled consistently, the pen pressure detection has great deviation and even cannot be used, the writing physical examination is greatly discounted, and the quality and the service life of the product are seriously influenced.
2. Mode B pressure information sees through self-defined modem signal transmission, because of its adoption self-defined frequency and modem signal, the communication is extremely unstable, and the large probability receives wrong pressure information and can't avoid, leads to the pressure numerical value to hop often, writes and experiences extremely badly.
3. The signal frequency band of the wireless signals related to the mode a and the mode B is privately defined, and is not an internationally allowed universal wireless signal, so that the products cannot be approved in the international market, and even are prohibited from being sold.
Based on the existing defects, a system for generating the pen pressure information of the active capacitive stylus is provided.
Disclosure of Invention
In order to solve the problems of the conventional active capacitive stylus, an object of the present invention is to provide a system for generating pressure information of an active capacitive stylus, which has a function of transmitting digitized pressure information via a general wireless signal, is not limited by wireless signal resources, and can stably generate pressure information, so as to solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: a pen pressure information generation system of an active capacitive touch pen comprises the active capacitive touch pen, an induction driving board and a capacitive induction screen body. Active electric capacity touch-control pen includes nib and pen container, and the nib assembly is in the front end of pen container, and the inside assembly of pen container has pressure sensor, wireless data transmission circuit, PCB board, battery and power management module, and integrated on the PCB board has nib signal processing circuit, and pressure sensor, wireless data transmission circuit are connected with PCB board electricity, and pressure sensor, wireless data transmission circuit, PCB board all are connected with power management module electricity, and power management module is connected with the battery electricity.
Preferably, the pen tip signal processing circuit comprises an operational amplifier U6 and an operational amplifier U7, wherein a pin 3 of the operational amplifier U6 is connected to an output end of a capacitor C35 and an input end of a capacitor C36, an input end of a capacitor C35 is connected to a pin 17 of a chip U4, two ends of the capacitor C36 are connected with a resistor R25 in parallel and connected to a pin 4 of an operational amplifier U6, a pin 5 of the operational amplifier U6 is connected to a +9V power supply input end, a pin 2 of the operational amplifier U6 is connected to an input end of the capacitor C33, and an output end of the capacitor C33 is grounded; a pin 4 of the operational amplifier U6 is connected to an input end of a capacitor C31, an output end of a capacitor C31 is connected to an input end of a resistor R23, an output end of the resistor R23 is connected to a pin 3 of an operational amplifier U7 and is connected to input ends of a resistor R21 and a resistor R22, output ends of the resistor R21 and a resistor R22 are connected to a pin 4 of the operational amplifier U7, a pin 5 of the operational amplifier U7 is connected to a +9V power supply input end, a pin 2 of the operational amplifier U7 is connected to an input end of a capacitor C30, and an output end of the capacitor C30 is grounded; pin 4 of the operational amplifier U7 is connected to the input of a capacitor C28, and the output of the capacitor C28 is connected to the J10-1 terminal.
Preferably, the wireless data transmission circuit comprises a chip U4, a pin 18 of the chip U4 is connected to an output end of a resistor R12, an input end of a resistor R12 is connected to an output end of a battery, an output end of a resistor R12 is connected to an input end of a resistor R13, and an output end of a resistor R13 is grounded; the pin 23 of the chip U4 is connected to the input ends of a capacitor C19 and a capacitor C20, and the output ends of the capacitor C19 and the capacitor C20 are grounded after being connected; the pin 21 of the chip U4 is connected to the input end of Y1 and to the input end of a capacitor C21, and the output end of a capacitor C21 is grounded; the output end of the Y1 is connected to the input end of the capacitor C22 and connected to the pin 22 of the chip U4, and the output end of the capacitor C22 is grounded; a pin 24 of the chip U4 is connected to an input end of a resistor R15 and an input end of a capacitor C23, an output end of the capacitor C23 is grounded, and an output end of the resistor R15 is connected to an output end of a capacitor C24 and is connected to a pin ANTENNA terminal of the chip U4; a pin 19 of the chip U4 is connected to an input end of a resistor R14, an output end of the resistor R14 is connected to an input end of a power indicator LED3, and an output end of the power indicator LED3 is grounded; pin 23 of the chip U4 is connected to the input of resistor R11, the output of resistor R11 is connected to the input of switch S1 and to the KEY terminal, and the output of switch S1 is connected to ground.
Preferably, the power management module comprises a voltage stabilizing circuit, a lithium battery protection circuit, a booster circuit and a power input; the voltage stabilizing circuit comprises a chip Q2, wherein the model of the chip Q2 is XC6206P28, a pin 3 of the chip Q2 is connected to the output end of a battery (16) and the input ends of a capacitor C5 and a capacitor C6, and the output ends of the capacitor C5 and the capacitor C6 are grounded; pin 1 of the chip Q2 is grounded, pin 2 of the chip Q2 is connected to the VDD3.3 power supply output terminal and is connected to the input ends of a capacitor C7 and a capacitor C8, and the output ends of the capacitor C7 and a capacitor C8 are grounded; the output end of the lithium battery protection circuit is electrically connected with the input end of the booster circuit, and the output end of the booster circuit is connected with the input end of the pen point signal processing circuit for power supply.
Compared with the prior art, the invention has the beneficial effects that: according to the pen pressure information generation system of the active capacitive touch pen, the pressure sensor senses the pressure information of the pen point, the obtained pressure signal is transmitted to the pen point signal processing circuit of the PCB, the pen point signal processing circuit converts the obtained analog signal into a digital signal, the wireless data transmission circuit processes the obtained digital information and transmits the digital information to the induction drive board, the induction drive board receives the pen pressure information sent by the wireless data transmission circuit, and the induction drive board is combined with the coordinate information obtained by the capacitive induction screen body to obtain a new coordinate form with the pen pressure information, so that the writing effect with the pen pressure is realized.
Drawings
Fig. 1 is a block diagram of an overall structure of an active capacitive stylus according to the present invention.
FIG. 2 is a frame map of an active capacitive stylus of the present invention;
FIG. 3 is a diagram of an active capacitive stylus pen pressure generating system according to the present invention;
FIG. 4 is a pen tip signal processing circuit of the present invention;
FIG. 5 is a circuit diagram of the wireless data transmission circuit of the present invention;
FIG. 6 is a diagram of a voltage regulator circuit according to the present invention;
FIG. 7 is a circuit diagram of a lithium ion battery charging circuit according to the present invention;
FIG. 8 is a circuit diagram of a lithium battery protection circuit according to the present invention;
FIG. 9 is a boost circuit diagram of the present invention;
fig. 10 is a power input wiring diagram of the present invention.
In the figure: 1. an active capacitive stylus; 11. a pen point; 12. a pen container; 13. a pressure sensor; 14. a wireless data transmission circuit; 15. a PCB board; 16. a battery; 17. a power management module; 2. an induction drive plate; 3. capacitive sensing screen body.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-10, a system for generating pen pressure information of an active capacitive stylus includes an active capacitive stylus 1, a sensing driver board 2 and a capacitive sensing screen body 3, where the active capacitive stylus 1 includes a pen tip 11 and a pen container 12, the pen tip 11 is assembled at a front end of the pen container 12, a pressure sensor 13, a wireless data transmission circuit 14, a PCB 15, a battery 16 and a power management module 17 are assembled inside the pen container 12, a pen tip signal processing circuit is integrated on the PCB 15, the pressure sensor 13, the wireless data transmission circuit 14 and the PCB 15 are electrically connected to the power management module 17, and the power management module 17 is electrically connected to the battery 16.
Wherein: the pen tip signal processing circuit comprises an operational amplifier U6 and an operational amplifier U7, wherein a pin 3 of the operational amplifier U6 is connected to an output end of a capacitor C35 and an input end of the capacitor C36, an input end of a capacitor C35 is connected to a pin 17 of a chip U4, two ends of the capacitor C36 are connected with a resistor R25 in parallel and connected to a pin 4 of an operational amplifier U6, a pin 5 of the operational amplifier U6 is connected to a +9V power supply input end, a pin 2 of the operational amplifier U6 is connected to an input end of the capacitor C33, and an output end of the capacitor C33 is grounded; a pin 4 of an operational amplifier U6 is connected to an input end of a capacitor C31, an output end of a capacitor C31 is connected to an input end of a resistor R23, an output end of the resistor R23 is connected to a pin 3 of an operational amplifier U7 and is connected to input ends of a resistor R21 and a resistor R22, output ends of the resistor R21 and a resistor R22 are connected to a pin 4 of the operational amplifier U7, a pin 5 of the operational amplifier U7 is connected to a +9V power supply input end, a pin 2 of the operational amplifier U7 is connected to an input end of a capacitor C30, and an output end of the capacitor C30 is; pin 4 of operational amplifier U7 is connected to the input of capacitor C28, and the output of capacitor C28 is connected to the J10-1 terminal.
Wherein: the wireless data transmission circuit 14 comprises a chip U4, a pin 18 of the chip U4 is connected to the output end of a resistor R12, the input end of a resistor R12 is connected to the output end of the battery 16, the output end of a resistor R12 is connected to the input end of a resistor R13, and the output end of a resistor R13 is grounded; a pin 23 of the chip U4 is connected to the input ends of the capacitor C19 and the capacitor C20, and the output ends of the capacitor C19 and the capacitor C20 are grounded after being connected; a pin 21 of the chip U4 is connected to the input end of the Y1 and is connected to the input end of the capacitor C21, and the output end of the capacitor C21 is grounded; the output end of the Y1 is connected to the input end of the capacitor C22 and connected to the pin 22 of the chip U4, and the output end of the capacitor C22 is grounded; pin 24 of the chip U4 is connected to the input terminal of the resistor R15 and to the input terminal of the capacitor C23, the output terminal of the capacitor C23 is grounded, the output terminal of the resistor R15 is connected to the output terminal of the capacitor C24 and to the pin ANTENNA terminal of the chip U4; a pin 19 of the chip U4 is connected to an input end of a resistor R14, an output end of the resistor R14 is connected to an input end of a power indicator LED3, and an output end of the power indicator LED3 is grounded; pin 23 of chip U4 is connected to the input of resistor R11, the output of resistor R11 is connected to the input of switch S1 and to the KEY terminal, and the output of switch S1 is connected to ground.
Wherein: the power management module 17 comprises a voltage stabilizing circuit, a lithium battery protection circuit, a booster circuit and a power input; the voltage stabilizing circuit comprises a chip Q2, wherein the model of the chip Q2 is XC6206P28, a pin 3 of the chip Q2 is connected to the output end of the battery 16 and is connected to the input ends of a capacitor C5 and a capacitor C6, and the output ends of the capacitor C5 and the capacitor C6 are grounded; pin 1 of the chip Q2 is grounded, pin 2 of the chip Q2 is connected to the VDD3.3 power supply output terminal and is connected to the input ends of a capacitor C7 and a capacitor C8, and the output ends of the capacitor C7 and a capacitor C8 are grounded; the lithium battery output is connected with lithium battery protection circuit's input electricity, and lithium battery protection circuit's output is connected with boost circuit's input electricity, and nib signal processing circuit's input power supply is received to boost circuit's output.
This active electric capacity touch-control pen's stroke pressure information generation system, by pressure sensor 13 perception nib 11's pressure information, the nib signal processing circuit of pressure signal transmission for PCB board 15 that will obtain, the analog signal transmission who will obtain by nib signal processing circuit gives wireless data transmission circuit 14, wireless data transmission circuit 14 is to the digital information processing back that obtains, the transmission gives the response drive plate 2, the stroke pressure information z that wireless data transmission circuit 14 sent is received to response drive plate 2, capacitive sensing screen body 3 is used for contacting with nib 11, perception nib 11 produces analog touch-control signal, obtain the coordinate information (x of nib 11, y), form coordinate form (x, y, z), realize the writing effect of taking the stroke pressure.
In summary, according to the system for generating the pen pressure information of the active capacitive touch pen provided by the present invention, the pressure sensor 13 senses the pressure information of the pen tip 11, the obtained pressure signal is transmitted to the pen tip signal processing circuit of the PCB 15, the pen tip signal processing circuit transmits the obtained analog signal to the wireless data transmission circuit 14, the wireless data transmission circuit 14 processes the obtained digital information and transmits the processed digital information to the sensing driving board 2, the sensing driving board 2 receives the pen pressure information z sent by the wireless data transmission circuit 14, and the sensing driving board 2 combines the coordinate information obtained by the capacitive sensing screen body 3, so as to obtain the coordinate form and realize the writing effect with pen pressure.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (4)
1. A pressure information generation system of an active capacitive touch pen is characterized by comprising the active capacitive touch pen (1), a sensing driving board (2) and a capacitive sensing screen body (3), wherein the active capacitive touch pen (1) comprises a pen point (11) and a pen container (12), the pen point (11) is assembled at the front end of the pen container (12), a pressure sensor (13), a wireless data transmission circuit (14) and a PCB (15) are assembled in the pen container (12), battery (16) and power management module (17), integrated nib signal processing circuit on PCB board (15), pressure sensor (13), wireless data transmission circuit (14) are connected with PCB board (15) electricity, and pressure sensor (13), wireless data transmission circuit (14), PCB board (15) all are connected with power management module (17) electricity, and power management module (17) are connected with battery (16) electricity.
2. The system of claim 1, wherein the system further comprises: the pen tip signal processing circuit comprises an operational amplifier U6 and an operational amplifier U7, wherein a pin 3 of the operational amplifier U6 is connected to an output end of a capacitor C35 and an input end of the capacitor C36, an input end of a capacitor C35 is connected to a pin 17 of a chip U4, two ends of the capacitor C36 are connected with a resistor R25 in parallel and connected to a pin 4 of an operational amplifier U6, a pin 5 of the operational amplifier U6 is connected to a +9V power supply input end, a pin 2 of the operational amplifier U6 is connected to an input end of the capacitor C33, and an output end of a capacitor C33 is grounded; a pin 4 of the operational amplifier U6 is connected to an input end of a capacitor C31, an output end of a capacitor C31 is connected to an input end of a resistor R23, an output end of the resistor R23 is connected to a pin 3 of an operational amplifier U7 and is connected to input ends of a resistor R21 and a resistor R22, output ends of the resistor R21 and a resistor R22 are connected to a pin 4 of the operational amplifier U7, a pin 5 of the operational amplifier U7 is connected to a +9V power supply input end, a pin 2 of the operational amplifier U7 is connected to an input end of a capacitor C30, and an output end of the capacitor C30 is grounded; pin 4 of the operational amplifier U7 is connected to the input of a capacitor C28, and the output of the capacitor C28 is connected to the J10-1 terminal.
3. The system of claim 1, wherein the system further comprises: the wireless data transmission circuit (14) comprises a chip U4, a pin 18 of the chip U4 is connected to the output end of a resistor R12, the input end of a resistor R12 is connected to the output end of a battery (16), the output end of the resistor R12 is connected to the input end of a resistor R13, and the output end of a resistor R13 is grounded; the pin 23 of the chip U4 is connected to the input ends of a capacitor C19 and a capacitor C20, and the output ends of the capacitor C19 and the capacitor C20 are grounded after being connected; the pin 21 of the chip U4 is connected to the input end of Y1 and to the input end of a capacitor C21, and the output end of a capacitor C21 is grounded; the output end of the Y1 is connected to the input end of the capacitor C22 and connected to the pin 22 of the chip U4, and the output end of the capacitor C22 is grounded; a pin 24 of the chip U4 is connected to an input end of a resistor R15 and an input end of a capacitor C23, an output end of the capacitor C23 is grounded, and an output end of the resistor R15 is connected to an output end of a capacitor C24 and is connected to a pin ANTENNA terminal of the chip U4; a pin 19 of the chip U4 is connected to an input end of a resistor R14, an output end of the resistor R14 is connected to an input end of a power indicator LED3, and an output end of the power indicator LED3 is grounded; pin 23 of the chip U4 is connected to the input of resistor R11, the output of resistor R11 is connected to the input of switch S1 and to the KEY terminal, and the output of switch S1 is connected to ground.
4. The system of claim 1, wherein the system further comprises: the power supply management module (17) comprises a voltage stabilizing circuit, a lithium battery protection circuit, a booster circuit and a power supply input; the voltage stabilizing circuit comprises a chip Q2, wherein the model of the chip Q2 is XC6206P28, a pin 3 of the chip Q2 is connected to the output end of a battery (16) and the input ends of a capacitor C5 and a capacitor C6, and the output ends of the capacitor C5 and the capacitor C6 are grounded; pin 1 of the chip Q2 is grounded, pin 2 of the chip Q2 is connected to the VDD3.3 power supply output terminal and is connected to the input ends of a capacitor C7 and a capacitor C8, and the output ends of the capacitor C7 and a capacitor C8 are grounded; the output end of the lithium battery protection circuit is electrically connected with the input end of the booster circuit, and the output end of the booster circuit is connected with the input end of the pen point signal processing circuit for power supply.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911133082.6A CN110851003B (en) | 2019-11-19 | 2019-11-19 | Pen pressure information generation system of active capacitive touch pen |
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| CN201911133082.6A CN110851003B (en) | 2019-11-19 | 2019-11-19 | Pen pressure information generation system of active capacitive touch pen |
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| CN110851003B CN110851003B (en) | 2023-05-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022000739A1 (en) * | 2020-07-02 | 2022-01-06 | 深圳市鹰硕教育服务有限公司 | Smart pen pressure sensor drive circuit |
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| US20180275823A1 (en) * | 2017-03-27 | 2018-09-27 | Pixart Imaging(Penang) Sdn, Bhd. | Touch device and signal processing circuit as well as operating method thereof |
| US20190064942A1 (en) * | 2017-08-24 | 2019-02-28 | Acer Incorporated | Active stylus and detection method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022000739A1 (en) * | 2020-07-02 | 2022-01-06 | 深圳市鹰硕教育服务有限公司 | Smart pen pressure sensor drive circuit |
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